Zucchini,
A couple of questions if you don't mind.
1. What units were/are equipped with Achzarit and do we know how many entered service?
2. Is there any open source material on how the army organises its armour; how many tanks in a troop/section and how many in a squadron/platoon?
3. Do you recall the IDF in the 1990's issuing a directive which forbad personnel from using cell phones whilst on duty? Due to security reasons. I remember reading this somewhere.
The direction the army is taking with regards to its SPH requirements is interesting. Going for a wheeled based platform was something - to me at least - totally unexpected.
1. Achzarit, Nagmachon, and Nakpadon were all regional command-oriented vehicles, and some still are. The Achzarit and Nakpadon were first given to the northern command, which then allocated it to both the regional brigades (territorials, not maneuvering, just there to secure the area) and rotating infantry brigades.
After an event in 2004 when an M113 was destroyed around Gaza, it was decided these deployments would be shared with the southern command in charge of Gaza.
The Nagmachon is allocated to units rotating in the West Bank, although all above mentioned could be seen at times in all these regions.
Today it is said the reserve Alexandroni brigade (2nd inf brigade) uses most of the available Achzarit.
Since the most common infantry units in the north are the Golani and Givati, they were the most frequent users of the Achzarit until they moved on to the Namer.
The Namer has also been switched between units some time ago. Don't know if still is.
The IDF has 6 active and 13 reserve infantry brigades. Of the 6 active, 2 are very light and therefore have no IFVs, 2 are using Namers, and 2 are set to receive Eitans.
2. Usually 3 tank battalions per brigade, unknown amount of companies in a battalion, unknown amount of platoons in a company, and 2 tanks per platoon.
The unknowns are very dynamic as they change in peacetime quite frequently, and in wartime the brigades and battalions don't exist, as ad-hoc battlegroups are formed, tailored to their mission.
For example an infantry company may request only one tank for the mission so the other tank in a platoon joins to make a 3-tank platoon somewhere else.
The most up to date structure I could find is:
1 brigade -> 3 battalions -> 3 companies -> ??? platoons -> 2 tanks.
I know that each company has 11 so that must mean 4 platoons for a total of 8, plus 3 tanks as HQ.
This means that without battalion and brigade level HQ, there are 99 tanks in a brigade. I've heard somewhere a figure of 111 tanks per brigade.
Should be noted it takes roughly 3 years to rearm a brigade with new tanks, and the production rate is claimed to be ~30 tanks a year albeit the exact number is likely classified.
3. I don't remember such thing. Today every soldier carries his phone with him. The IDF does take SIGINT very seriously so I assume their presence where critical is minimized, but I do not know the directives for combat units.